The National Weather Service said new rainfall in Houston would amount to 5 and 8 cm with showers and thunderstorms throughout the day.

Houston mayor, Sylvester Turner, said in a news conference said that so far, around 5,000 people had been rescued to shelters in Houston.

The U.S. Department of Defence is also pre-positioning troops, search and rescue units, aircraft, vehicles, equipment and supplies to staging areas near the worst of the flooding in southeastern Texas in anticipation of a possible request for assistance.

Pentagon spokesman, Col. Robert Manning, gave the response efforts to Hurricane Harvey and its aftermath, and summarised activities of the Texas National Guard and the National Guard Bureau.

“Continuing rainfall from the hurricane is expected to cause devastating and life-threatening flooding throughout this week,” Manning said, adding, “Our thoughts and prayers are with the victims.”